Shank and bit punch



July 15, 1930. I L. c:. BAYLES SHANK AND BIT PUNCH Filed March 13, 1929b i i IN V EN TOR.

Lee I 41$ GBayieai 1175 ATTORNEY Patented July 15, 1930 N ED" TATE matame;;;;-;

LEWIS c. BAYLEs, or nasron, IENNSYLVANIA, AssrGNoR .TO" iNGERSOLLaRANDcom PANY, or JERSEY CITY, NEwJEnsnY, A CORPORATION or nEwJERsnY'; f;

SHAANK: nn BIT. ru non I Application filed Marchi3,-1929 'sia1nbQ3aa72af This invention relatesto devices for reforming the boresinhollow b0dies,but more particularly to a device commonly known as ashank and bit punch of the type used for re-forming the ends of-passagesin hollow drill steels after a prior dollying operation. One object ofthe invention is to insure both the driving of the working implementinto the work and its removal therefrom by 10 means of the positiveforce of the' blows of the percussive element. l r .r Another object isto selectivelyiexpose the working implement to the direct blows of thepercussive element for driving the work directly applied tothesworkingimplement v for Withdrawing it from'thewvork,

Still another ob 'ect is tolassure thevwithdrawal of theworkingimplement frornrithe Work in a minimum period of time, thus preventingthe transference of any considerable amount of heat from the work totheworking implement.

Other objects willbe in part obvious and in part pointed outhereinafter.

invention characters refer In the drawings illustrating the in whichsimilar reference to similar parts,

Figure 1 is a longitudinal Working implement into the work,

the withdrawal of the working implement from the work, and r t Figure 3is a transverse view taken through Figure. 1 on the line 3+3 looking inthe direction indicated by the arrows.

rings, A represents generally" a portion of a a bracket which may beattached to ;a=foundation (not shown) or to a drill sharpening machine,such as is usually equipped with ing implement into the work and toblows in sectional eleva- -o tion of so much of a shankand bit punch asi will serve to illustrate a the invention and showing the parts inposition for driving the Referring more particularly to the draw-cdevices to which the present invention p'ertains. BoltsE areshownexte'ndedthrough the supportB-for the purpose of "securing ,themachinefixedly in position.

The'percussive element C, onlya portion of which is shown,comprisesiacylinder F I having a piston chamber G wherein-isdis- Q poseda hammerfpiston H for strikingblows of impact. 7 The forward endof thecylinder (F is in this'instance supported by 'a' bearing J onthe supportBrand-has a reduced bore K which'opens into the 1 piston-chamber G andserves as aguide for an anvil block L, the shank .of which extends intothe "front end of thepis'ton chamber G to i receive the blowsofthehammer'piston i In ordertolimitlthe distance which the shank-O of-theanvil block will extend into the pistonchamber, said anvilblock is pro--Videdwith acollar P adapted to bear against '-the frontend ofthecylinder F. Preferably thecolla'r P islocated intermediate the ends ofthe anvil'blo'ck L so that a stem Q of the" anvilblock extendsunsupported beyond the end of thecylinder F. I t a a In order tosimplify theoperationof-insetting the punch pinD into the device anditsremoval therefrom, saidpu'nch pin is.pro vided with a shank R adaptedto be inserted into the bore *Sof a holder T disposedslid ably in abea'ringU on thesup'port Bi a A known means, suchjas a-pin V, may-beusediforlocking the punch pin into the holder. T. The -,pin V may extendtransversely through-the holder to engage a notch in the shank- R-of thepunchpin. Theholder T in this instance is in the form of ajcylindricalchuck carrying at its rearward. end a collar X and the holder is of:such length that it may be, readilycarried into contact with the end ofthe stem Q of1the'anvil block The work whereon the punchpin V is intended to operate is designatedby Y andmay consist of a drill steel orothersimilararticle ng passage Zjtherethrou h. I

The' followingisgabrief explanation I garding ,thef work 'which shankand bit. punches of thetype described are intended toaccomplish, withparticular respect to drill steels, since that type of tools requirefrequent forging operations at their extremities. This is particularlytrue of the bit end of the steel which readily becomes dulled. throughusage, although the opposite or shank end also becomes battered'by theterrific force delivered thereagainst by the percussive element of thedrilling apparatus. a

Before refinishing the ends of the drill steel they are of course'heatedso that they will yieldreadily to'the shape of the form ing dollies.However, due to that fact the ends of the passage in the drill steelusually become filled with metal or, at best, deformed to a degree whereit is again necessary to 'reform the ends thereof so that a sufficientvolume of cleansing fluid maypass through the drill steel to properlycleanse the drill hole.

In machines to which the present invention pertains, the progress of theworking implement, such as the punch pin D, into the work isusuallyrapid. Howeven owing to the fact that the work is heated to a hightemperature and that the punch pin-D is comparatively cool, the heatedmetal adj acentthepunch pin will .be cooled somewhat 'zthereby. Thiscauses, the work to shrinkfand adhere to the punch pin. It will thus,beseen that the operation of removingthe punch pin from the work aftersuch shrinkage of the work on the punch pin maynot beso readilyaccomplished.

Efforts are constantly-being.made and means devised foreffecting thespeedy removal of the punch pin from the work, as

for instance the utilization of the shock resulting from therearward'movement of the hammer piston for loosening thepuneh pin fromthe work. The effect however is a weak force which falls short of thedesired result.

The present invention aims to assure not only the rapid driving of thepunch pininto 1 the work but its-equally speedy removal therefrom andalso aims to obtain this latter result without requiring themanipulation of means other than those employedfor driv-i ing the pininto" the work. The means provided for this purpose comprisesa pair oflevers b and 0 mounted on pivots-d and a respectively seated in thesupport B. The lever b may be in the form. of a bell crank having an armf which extends'toward the lever c and on the opposite'side ofthe pivotd are a pair of arms 9 which-lieo'n the opposite sides of the holderTand are adaptedto bear against the forward surface of the collar S. I

The lever 0 may also have ap'air of arms k, and when thus formed saidarms lie on opposite sides of the collar P of the anvil block. The lever0 overlapsthe arm f and has a heel j which normally bears against thearmsf. Preferably the pivots'whereon work Y may be pressed against theend of the punch pin D to reopen the passage Z.

By pressing rearwardly against the punch pin D, the'ho'lder T willbe'brought' directly into cont-act with the stem Q of the anvil blockand the anvil block will be held in its rearwardmost limiting positionso that the shank 0 thereof will lie within the range of theblows of thehammer piston H. Continued pressure of the work against the punch pinwill cause said punch pin to be driven into the passage Z. This pressureof the work against the punch pin may be applied directly by theoperator who may support the work or may be applied in any othersuitablemanner.

During the driving-in operation the levers b and 0 are'ineffective toproduce a force on the elements against which they are adapted to bearinthe succeeding operation of withdrawing the'punch pin from the work.

After the punch pin has been driven into the work to the limit of itsextent, the work may. be retracted and in rare instances the force thusapplied may free it from the punch pin Du Usually, however, thefrictional engagement between the work and the punch pinwhich takesplace is of such extent that the. force which may be applied by manualmovement of the holder T will separate theholder and the anvilblock andwill carry the collar X of the holder forwardly against the arms 9 ofth'elever b. This will cause the lever 72 to rock about its pivot and toraise the arm f forcibly againstthe heel j of the lever c.- The arms hof the'l'ever 0 will then be'carriedinto'contact with the collar P ofthe anvil block L, meanwhile the hammer piston H will be reciprocatingand delivering its blows againthe shank O of the anvil blockfl In viewof the fact that the anvil block and the holder will then no longer bein contact, the force of the blows of the hammer piston against theanvil block will be transmitted through the levers Z) and 0 to theforward surface of the collar X. The direcpin from the work may beaccomplished its with the same degree of rapidityas that of driving :thepunchpininto the work, it-being merely necessary for theoperator to apply a pressure to the punch pin in agdirection reverseto that requiredfor driving the punch pin into the work The operation of reversal may bespeedily accomplished by merely pulling on the work and does "notrequire the Vmanipulation of means other than the-work.

Although "I have illustrated in the-drawings only one preferred meansfor attaining the objects sought, it is to be understood that theinvention. may be variously" modified without departingfrom the spiritthereof or the scope of the claims; Iclaim: i 1. In a shank and bitpunch, the combination of a percussive element and-a working implementadapted to be driven into the work by the direct force of the forwardlydirected blows. of the percussiveelement, and means selectivelyexposedto such forwardly directed. blows and acting in a reverse directionagainst theworking implement to withdraw said workingimplement fromthework.

2-. Ina shank and bit punch, thejcombinationof apercussive element and aworking implementadapted to be driven intothework working implement.

separation of the first said'means by; the percussive element, meansforming a direct path for the forwardly directed blows of the percussiveelement to the'working implement todrive said implement into the work,and means for forming an indirect path for such forwardly directed blowsto the working implement to withdraw said working implement from thework upon theinthe continuitygof the direct the working implement towithdraw said working implement from the work upon the 4. In a shank andbit punch, the combination ofa percussive element and a workingimplement adapted to'be selectively moved into and out of the directexposure to the blows of the percussive element, and means forselectively. eXertinga-force' against theworking implement in adirection counter to the direction of the force of theblows of thepercussive element and being subjected to such blows for removing theWorking implementfrom the work.

5. In a shank and bit punch, the combination of a percussive elementanda working implement, an anvil block for transmitting and the ithe-blows; of the percussive element to the working implement andadaptedto. be, held within the range of the blows of the percus sive,element'by the working implement for a driving the working implementinto'athe work, and means. actuated by; the working implement ,forholding the anvil block with 'inthe range of the blows of the percussiveelement, and for transmitting such .blows .to the working-implement uponseparation of the. anvil blockand theworking implement In ashankandbitpunch, the combinae tion of a cylinder: having a piston chamberand a hammer piston in the piston chamber,

a: working implement adapted to be driven of the hammer piston, andmeans for-reversv '7 into the work by forwardly directed-blows ing the aforce of su'ch forwardly directed A blows to withdraw the workingimplement from the work. r 1

-,7-. vIn a shank :andibit punch,,the combination" of a cylinder havinga piston chamber. and a-hammer piston in the pistonchamber, aworkingimplementadapted to be driven into the workby forwardly. directed blowsof the hammer piston, and means selectively exposed to blows deliveredinithe same direction forreversing the force of such blows to.;withdrawthe working implement from the work.;

V 8. .In-ashank and bit punch the combina t on of a cy-lmder having apiston chamber and a hammer piston in thepiston chamber, 7

a workingimplement, means for transmitting the forwardlydirectedblows-of the hammer piston directly to the working implement todrive said working-implement into the work, and means ;forindirectlytransmitting simis larly directed blows of the hammer piston to the,working implement to" withdraw-it from the work.

9. In. a. shank and bit punch, thecombina5 tion of a, cylinder having apiston chamber and a hammer piston in-the piston chamber, a workinglimplement, means interposed between the hammer piston and theworkingimplement for transmitting the blows of the hammer P o 1 1y,,to tl1esaid work n implement, and means oif-setwith-respectto,

the first said means and-associated therewith and wit-h the workingimplement'forreversing the force or such blows'to withdrawxthe v 7Working implement from ,the work.

i 10. In a'shank and bit-punch, the'combinati-onofa cylinder having apiston chamber and a hammer piston in thepiston chamber,

a workingimplement arranged coaxially with the hammer pistonpan anvilblockfor transmittingthe -blows ofithe hammer piston directlytojtheworking implement, and means for holding'the anvil block free of contact7 from the workingimplement and for-trans mitting the blows of the anvilblock to the workingimplement to withdraw said ing implement from thework, 1

worktion of a cylinder having a piston chamber and a hammer piston inthe piston chamber,

a working implement, a holder therefor, an anvil block-between theholder and'the hammer piston for transmitting the blows of the hammerpiston to the working implement to drive the working implement into theWork, and means associated with the holder and the anvil block fortranslating the force of the blows of the hammer piston acting in onedirection into a force acting in a counter direction for withdrawing theWorking implement from the work. I

12. In a shank and bit punch, the combination of a cylinderhavinga-piston chamber and a hammer piston in the" piston chamber,-aworking implement, a holder therefor, an anvil block between the holderand the hammer pistonfor transmitting the blows of the hammer piston tothe working implement to drive the working implement into the work, andmeans associated with the holder and the anvil block for translating theforce of the blows of the hammer piston acting in a forwardly directioninto a force acting in a rearwardly direction for Withdrawing theworking implement from the work.

13. In a shank and bit punch, the combination of a cylinder having apiston chamber and a hammer piston in the piston chamber, a workingimplement, a'holder therefor, an anvil block interposed between thehammer piston and the holder for transmitting the blows of the hammerpiston to the working implement to drivethe workingimplement into thework, and'a plurality of levers arranged to respond to the movement ofeach other, one of said levers acting against the anvil block andanother lever acting against the holder upon withdrawal of the holderfrom theanvil block for transmitting the forwardly directed blows'ofthehammerfpiston indirectly to the holder and for reversing the force ofsuch blowsto withdraw the working implement from the work. 7 a 14.In'a'shank and bit punch, the combination'of a cylinderhaving a pistonchamber and a hammer piston in the piston chamber, a support, a'workingimplement, a holder therefor slidable' in the support, an anvil blockinterposed between the hammer piston and the holder for transmittingtheblows of the hammer piston to the Working implement to drive saidworking implement into the work, and a plurality of'leve'rs pivoted onthe support and having contacting portions for transmitting the movementof one lever to anotherlever, one of saidlevers actin against the holderto form anindirect pat to the 15. In a shankand bit-punch,the combination of a cylinder having a piston chamber and a hammer piston in-thepiston chamber,

a support fo'r the cylinder, a working imp'lement, a holder thereforlslidable in-the support, an anvil block slidable inthecylinder and'a'dapted to t'ransmit the blows of the hammer piston to'the Workingimplement to drive the said working implement into the work, and aplurality of levels pivoted on the support and having contactingportions for transmitting the movementof one lever to another, one ofsaid levers acting against the anvil block and another lever actingagainst the holder and in the-same direction as the first said lever,thusforming an indirect path for and causing the reversal of the-forceof the blows of the hammer piston to.- withdraw the working implementfrom the work.

16. In a shank and bit punch, the combina tion of a cylinder having apiston chamber and a hammer'piston in thepiston chamber,

a working implement, means actuated by the blows of the hammerv pistonacting in one direction for drivingthe'working implement into the work,and means actuated by blows acting in the same-direction for'removingthe working implement from the work.

17. In a shank and bit punch,the combination of a cylinder ha'vinga;piston chamber and a hammer piston in the piston chamber, a workingimplement adapted to be driven into the work bythe blows ofthe hammerpiston acting inane direction, and means for selectively reversing-theforce of the blows of the hammer piston acting in the same direction towithdraw the working implement from the work.

'In testimony whereof I have signed this specification. 7

' LEWIS BAYLES.

holder for the transmission of forwardly directedblows ,of'the hammerpistonand for efiecting. the reversal of the force of such

